Buggy code:
public abstract class BaseDistributedSearchTestCase extends SolrTestCaseJ4 { public static Random r ; @ BeforeClass public static void initialize ( ) { } @ BeforeClass public static void initHostContext ( ) { StringBuilder hostContext = new StringBuilder ( "//" ) ; if ( random ( ) . nextBoolean ( ) ) { hostContext . append ( _TestUtil . randomSimpleString ( random ( ) , 2 ) ) ; if ( random ( ) . nextBoolean ( ) ) { hostContext . append ( "_" ) ; } hostContext . append ( _TestUtil . randomSimpleString ( random ( ) , 3 ) ) ; <START_BUG> if ( ! ( "//" . equals ( hostContext ) ) ) { <END_BUG> hostContext . append ( "//" ) . append ( _TestUtil . randomSimpleString ( random ( ) , 2 ) ) ; } else { } } final String hc = hostContext . toString ( ) . replaceAll ( "\\//+" , "//" ) ; BaseDistributedSearchTestCase . log . info ( ( "Setting<seq2seq4repair_space>hostContext<seq2seq4repair_space>system<seq2seq4repair_space>property:<seq2seq4repair_space>" + hc ) ) ; System . setProperty ( "hostContext" , hc ) ; } @ AfterClass public static void clearHostContext ( ) throws Exception { } private static String getHostContextSuitableForServletContext ( ) { } protected BaseDistributedSearchTestCase ( ) { } protected BaseDistributedSearchTestCase ( final String context ) { } protected int shardCount = 4 ; protected boolean fixShardCount = false ; protected JettySolrRunner controlJetty ; protected List < SolrServer > clients = new ArrayList < SolrServer > ( ) ; protected List < JettySolrRunner > jettys = new ArrayList < JettySolrRunner > ( ) ; protected String context ; protected String [ ] deadServers ; protected String shards ; protected String [ ] shardsArr ; protected File testDir ; protected SolrServer controlClient ; protected int stress = ( TEST_NIGHTLY ) ? 2 : 0 ; protected boolean verifyStress = true ; protected int nThreads = 3 ; public static int ORDERED = 1 ; public static int SKIP = 2 ; public static int SKIPVAL = 4 ; public static int UNORDERED = 8 ; protected int flags ; protected Map < String , Integer > handle = new HashMap < String , Integer > ( ) ; protected String id = "id" ; public static Logger log = LoggerFactory . getLogger ( BaseDistributedSearchTestCase . class ) ; public static BaseDistributedSearchTestCase . RandVal rint = new BaseDistributedSearchTestCase . RandVal ( ) { @ Override public Object val ( ) { } } ; public static BaseDistributedSearchTestCase . RandVal rlong = new BaseDistributedSearchTestCase . RandVal ( ) { @ Override public Object val ( ) { } } ; public static BaseDistributedSearchTestCase . RandVal rfloat = new BaseDistributedSearchTestCase . RandVal ( ) { @ Override public Object val ( ) { } } ; public static BaseDistributedSearchTestCase . RandVal rdouble = new BaseDistributedSearchTestCase . RandVal ( ) { @ Override public Object val ( ) { } } ; public static BaseDistributedSearchTestCase . RandVal rdate = new BaseDistributedSearchTestCase . RandDate ( ) ; public abstract void doTest ( ) throws Exception { } public static String [ ] fieldNames = new String [ ] { "n_ti1" , "n_f1" , "n_tf1" , "n_d1" , "n_td1" , "n_l1" , "n_tl1" , "n_dt1" , "n_tdt1" } ; public static BaseDistributedSearchTestCase . RandVal [ ] randVals = new BaseDistributedSearchTestCase . RandVal [ ] { BaseDistributedSearchTestCase . rint , BaseDistributedSearchTestCase . rfloat , BaseDistributedSearchTestCase . rfloat , BaseDistributedSearchTestCase . rdouble , BaseDistributedSearchTestCase . rdouble , BaseDistributedSearchTestCase . rlong , BaseDistributedSearchTestCase . rlong , BaseDistributedSearchTestCase . rdate , BaseDistributedSearchTestCase . rdate } ; protected String [ ] getFieldNames ( ) { } protected BaseDistributedSearchTestCase . RandVal [ ] getRandValues ( ) { } public String getSolrHome ( ) { } @ Override public void setUp ( ) throws Exception { } @ Override public void tearDown ( ) throws Exception { } protected void createServers ( int numShards ) throws Exception { } protected void setDistributedParams ( ModifiableSolrParams params ) { } protected String getShardsString ( ) { } protected void destroyServers ( ) throws Exception { } public JettySolrRunner createJetty ( File solrHome , String dataDir ) throws Exception { } public JettySolrRunner createJetty ( File solrHome , String dataDir , String shardId ) throws Exception { } public JettySolrRunner createJetty ( File solrHome , String dataDir , String shardList , String solrConfigOverride , String schemaOverride ) throws Exception { } protected SolrServer createNewSolrServer ( int port ) { } protected void addFields ( SolrInputDocument doc , Object ... fields ) { } protected void indexr ( Object ... fields ) throws Exception { } protected SolrInputDocument addRandFields ( SolrInputDocument sdoc ) { } protected void index ( Object ... fields ) throws Exception { } protected void indexDoc ( SolrInputDocument doc ) throws IOException , SolrServerException { } protected UpdateResponse add ( SolrServer server , SolrParams params , SolrInputDocument ... sdocs ) throws IOException , SolrServerException { } protected UpdateResponse del ( SolrServer server , SolrParams params , Object ... ids ) throws IOException , SolrServerException { } protected UpdateResponse delQ ( SolrServer server , SolrParams params , String ... queries ) throws IOException , SolrServerException { } protected void index_specific ( int serverNumber , Object ... fields ) throws Exception { } protected void del ( String q ) throws Exception { } protected void commit ( ) throws Exception { } protected QueryResponse queryServer ( ModifiableSolrParams params ) throws SolrServerException { } protected void query ( Object ... q ) throws Exception { } protected void query ( boolean setDistribParams , Object [ ] q ) throws Exception { } public QueryResponse queryAndCompare ( SolrParams params , SolrServer ... servers ) throws SolrServerException { } public static boolean eq ( String a , String b ) { } public static int flags ( Map < String , Integer > handle , Object key ) { }

Fix:
if ( ! ( "//" . equals ( hostContext . toString ( ) ) ) ) {